Shared structure of newly-added foundation of cultural relic building and newly-built building and construction method thereof

Abstract

The application discloses a kind of cultural relic buildings new foundation and new building co-construction structure and its construction method, comprising: support structure, including multiple enclosure piles and crown beam, multiple the enclosure piles are along the contour line of new building foundation pit Settings, the crown beam is connected to the upper end of multiple the enclosure piles;Supporting plate is connected to the top of the support structure and the load-bearing outer wall of adjacent cultural relic building of new building;Underground structure is poured in the inner side of the support structure, the supporting plate is connected to the outer wall of the underground structure by extension plate band, and the support structure is filled with backfill between the outer wall. The application solves the problem that the new building structure beside the ancient building of the immovable cultural relic adopts the traditional foundation pit support structure construction and is easy to disturb the ancient building.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a co-construction structure for new foundations and new buildings in historical buildings and its construction method. Background Technology

[0002] In historic old town areas, the basement boundaries of newly constructed buildings are often very close to the foundations of immovable cultural relics. Traditional foundation pit support for new buildings (such as the combination of piles and capping beams) is separate and independent from the foundation of the new building. Both require their own valuable space and may cause the foundation pit support structure of the new building to encroach on the cultural relic protection area, or sacrifice the basement area of ​​the new building in order to avoid cultural relics.

[0003] New buildings typically involve constructing the support structure first, followed by the main structure. This process is complex and time-consuming. The support structure, being a temporary structure, often needs to be dismantled or abandoned later, resulting in waste. Furthermore, repeated excavation and vibration pose a continuous threat to the safety of cultural relics.

[0004] In addition, traditional support structures only serve to retain soil and stop water, and their contribution to controlling the uneven settlement of cultural relics is limited, requiring additional complex reinforcement measures. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, a co-construction structure for new foundations and new buildings of cultural relics is provided, along with its construction method. This addresses the problem that traditional foundation pit support structures used in the construction of new buildings next to immovable cultural relics can easily disturb the ancient buildings.

[0006] To achieve the above objectives, a co-construction structure for the foundation of a historical building and the new building is provided, comprising: The support structure includes multiple retaining piles and a capping beam. The multiple retaining piles are arranged along the outline of the foundation pit of the new building, and the capping beam is connected to the upper end of the multiple retaining piles. A support plate is connected to the top of the support structure and the load-bearing exterior wall of the cultural relic building adjacent to the new building; The underground structure is cast inside the support structure. The support plate is connected to the outer wall of the underground structure through an extension strip. Backfill soil is filled between the support structure and the outer wall.

[0007] Furthermore, the retaining piles are triaxial mixing piles, and the triaxial mixing piles are fitted with steel profiles.

[0008] Furthermore, the steel frame is an H-beam.

[0009] Furthermore, the capping beam is a concrete capping beam.

[0010] Furthermore, the inner side of the crown beam is provided with steel support.

[0011] This invention provides a construction method for a structure where a new foundation for a historical building is constructed in conjunction with a newly constructed building, comprising the following steps: Multiple retaining piles are driven along the outline of the foundation pit of the new building; A support slab is poured between the top of the multiple retaining piles and the load-bearing exterior wall of the adjacent historical building of the new building; A cap beam is poured on top of the multiple retaining piles to form a support structure; A steel support is provided on the inner side of the cap beam; Excavate the earthwork inside the support structure and pour the underground structure of the new building; Backfill soil is filled between the support structure and the lower part of the outer wall; An extension strip is cast along the surface of the support plate between the upper part of the support structure and the outer wall, so that the extension strip is connected to the outer wall of the underground structure.

[0012] The beneficial effects of this invention lie in its efficient space utilization of the newly constructed foundation for historical buildings and the co-construction structure of new buildings, achieving safe co-construction with "zero distance." This invention integrates the foundation pit support structure of the new building, the foundation load-bearing structure of the new building, and the newly constructed foundation for historical buildings into one unit. Under the extremely limited conditions where the edge of the basement of a new building in a historic old city is adjacent to the foundation of an immovable historical building, the support structure is set along the outline of the foundation pit. A support plate connects the top of the support structure to the load-bearing exterior wall of the historical building, and an extension strip connects to the exterior wall of the underground structure, achieving a "three-in-one" co-construction of foundation pit support, new building foundation, and historical building reinforcement. This structure minimizes disturbance to immovable cultural relics, achieving safe construction with "zero distance" or even "negative distance," effectively solving the problems of traditional solutions where the foundation pit support structure easily encroaches on the cultural relic protection area or requires sacrificing the basement area of ​​the new building. Attached Figure Description

[0013] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of the newly added foundation and the newly built building co-construction structure of the cultural relic building according to an embodiment of the present invention.

[0014] Figure 2 This is a schematic diagram of the plan structure of the co-construction of the foundation of the cultural relic building and the new building in an embodiment of the present invention.

[0015] Figure label: Support structure 1, retaining piles 11, steel frame 111, capping beam 12; Support plate 2, extension plate 21; Underground structure 3, exterior wall 31; 4 load-bearing exterior walls; Steel support 5; 6. Backfill soil. Detailed Implementation

[0016] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] Reference Figure 1 and Figure 2 As shown, the present invention provides a co-construction structure for the new foundation of a cultural relic building and the new building, including: a support structure 1, a support plate 2, and an underground structure 3.

[0019] The historical building is adjacent to the newly constructed building. The foundation pit of the newly constructed building has a supporting structure.

[0020] The support structure 1 includes multiple retaining piles 11 and a capping beam 12. Specifically, the multiple retaining piles 11 are arranged along the outline of the foundation pit of the new building. The capping beam 12 is connected to the upper end of the multiple retaining piles 11.

[0021] In this embodiment, the retaining pile 11 is a triaxial mixing pile. A steel frame 111 is inserted inside the triaxial mixing pile.

[0022] The support plate 2 is connected to the top of the support structure 1 and the load-bearing exterior wall 4 of the cultural relic building adjacent to the new building.

[0023] In this embodiment, the support plate serves as a new foundation for the historical building. The support plate is 1800mm thick and has a strength grade of C45P8, thus reinforcing the historical building.

[0024] As a preferred implementation, the steel frame 111 is an H-beam. Specifically, the retaining piles are SMW method piles, with H700mm×300mm×13mm×24mm H-beams inserted inside 850@1200mm triaxial mixing piles.

[0025] In this embodiment, the capping beam 12 is a concrete capping beam 12. The dimensions of the capping beam of the support structure are 700×1200mm, and the strength grade is C30.

[0026] After the capping beam is completed, steel supports 5 are installed on the inner side of the capping beam 12. After the steel supports are completed, the foundation pit is excavated to facilitate the construction of the underground structure.

[0027] The underground structure 3 is cast inside the support structure 1. The support plate 2 is connected to the outer wall 31 of the underground structure 3 via the extension plate 21. Backfill soil 6 is filled between the support structure 1 and the outer wall 31.

[0028] The backfill soil is compacted in layers to fill the gap between the basement exterior walls and the old building foundation.

[0029] In this embodiment, the steel (pipe) support is Φ609mm in size and is fixed to the embedded parts in the cap beam to provide support for the subsequent earthwork excavation.

[0030] The thickness of the subgrade layer of the underground structure is 100mm, and the specification is C20. The waterproof layer of the underground structure is a two-layer hot-melt SBB bitumen waterproof membrane. The thickness of the foundation of the underground structure is 120mm, and the strength grade is C45P8. The thickness of the exterior walls of the underground structure is 400mm, and the specification is C40. The thickness of the roof slab of the underground structure is 300mm, and the specification is C35.

[0031] This invention provides a construction method for a structure where a new foundation for a historical building is constructed in conjunction with a newly constructed building, comprising the following steps: S1. Drive multiple retaining piles along the outline of the foundation pit of the new building.

[0032] Specifically, step S1 includes: S11. Lay out the lines on the construction site according to the design drawings to determine the outline of the foundation pit and the pile positions of the retaining piles. The pile position deviation shall be controlled within the allowable range of the specifications. S12. A three-axis mixing pile machine is used for pile construction. The pile diameter is φ850mm and the pile spacing is 1200mm. The mixing sinking and lifting speeds meet the design requirements. The cement content and water-cement ratio are strictly controlled according to the mix proportion. S13. Before the initial setting of the mixing pile, insert H-shaped steel frames (specifications H700×300×13×24mm) at the designed position. The insertion depth and verticality of the steel frames are controlled by guide frames, and the verticality deviation is not greater than 1 / 200. S14. After the mixing piles reach the design strength, the top of the piles shall be chiseled or cleaned to ensure that the top elevation of the piles is consistent, so as to provide a flat working surface for the subsequent construction of the cap beam.

[0033] S2. A support plate 2 is poured between the top of multiple retaining piles 11 and the load-bearing outer wall 4 of the cultural relic building adjacent to the new building.

[0034] Specifically, step S2 includes: S21. Excavate the foundation earthwork on the outside of the load-bearing exterior wall of the cultural relic building, with the excavation depth reaching the design elevation of the bottom of the support slab, and clean up the loose soil at the base and compact the base. S22. Tie the steel reinforcement cage of the support plate between the top of the retaining pile and the load-bearing outer wall. The specifications, spacing and protective layer thickness of the steel reinforcement shall be set according to the design requirements. Connecting steel reinforcement shall be inserted on the side of the load-bearing outer wall to ensure effective anchoring of the old and new structures. S23. Install side formwork and continuously pour the support plate with C45P8 impermeable concrete in one go. The plate thickness is 1800mm. During the pouring process, use an immersion vibrator to compact the concrete and strengthen the vibration of key parts such as the base of the exterior wall. S24. After the concrete has set, cover it with plastic film or geotextile in a timely manner for moisture retention and curing. The curing time shall not be less than 14 days, and test blocks under the same conditions shall be retained to test the strength.

[0035] S3. Cast a cap beam 12 on top of multiple retaining piles 11 to form a support structure 1.

[0036] Specifically, step S3 includes: S31. Tie a cap beam steel cage at the top of the retaining pile. The cap beam is 700×1200mm in size. The longitudinal steel bars and stirrups are configured according to the design and are welded or lapped to the top of the steel frame of the retaining pile to form a whole bearing structure. S32. Install the side formwork of the cap beam, pour C30 concrete, vibrate and compact it, smooth and polish the surface, and cure it in time after pouring. S33. Subsequent steel support installation can only proceed when the concrete strength of the cap beam reaches more than 75% of the design strength grade.

[0037] S4. A steel support 5 is installed on the inner side of the crown beam 12.

[0038] Specifically, step S4 includes: S5. Excavate earthwork on the inside of the support structure 1 and pour the underground structure 3 of the new building. Specifically, step S5 includes: S51. After the steel support is in place and passes inspection, the soil in the foundation pit shall be excavated in a layered, symmetrical and balanced manner. The excavation depth of each layer shall not exceed 1.5m. Over-excavation is strictly prohibited. During the excavation process, the horizontal displacement of the support structure and the settlement of the cultural relics and buildings shall be closely monitored. S52. After excavating to the design elevation of the foundation, pour a 100mm thick C20 plain concrete cushion layer in a timely manner. The surface of the cushion layer should be flat and compacted to provide a base layer for the construction of the waterproof layer. S53. Lay two layers of hot-melt SBS modified bitumen waterproof membrane on the subbase, with the overlap width and bonding quality meeting the specifications, and ensure proper waterproof layer protection. S54. Tie the bottom slab reinforcement, external wall reinforcement and top slab reinforcement of the underground structure. The bottom slab thickness is 120mm, the external wall thickness is 400mm and the top slab thickness is 300mm. The reinforcement connection shall be mechanical connection or welding. S55. The concrete for the base slab, exterior walls and roof slab of the underground structure is poured in one go (base slab C45P8, exterior walls C40, roof slab C35). Layered pouring and layered vibration are adopted, and water-stop steel plates are installed at the horizontal construction joints of the exterior walls. S56. After the concrete is poured, it shall be covered and watered for curing for no less than 14 days, and the strength of the test blocks cured under the same conditions shall be tested simultaneously.

[0039] S6. Fill the space between the support structure 1 and the lower part of the outer wall 31 with backfill soil 6.

[0040] Specifically, step S6 includes: S61. After the concrete strength of the underground structure's exterior wall reaches the design requirements, remove debris and accumulated water between the exterior wall and the support structure. S62. Use cohesive soil or graded sand and gravel for backfilling in layers. The loose thickness of each layer should not exceed 300mm. Use small compaction equipment or manual compaction to compact the soil. The compaction coefficient should not be less than 0.94. S63. During the backfilling process, pay attention to symmetry and uniformity to avoid excessive soil pressure on one side, which may cause structural displacement. At the same time, keep good settlement observation records.

[0041] S7. An extension plate 21 strip is cast along the surface direction of the support plate 2 between the upper part of the support structure 1 and the outer wall 31, so that the extension plate 21 strip is connected to the outer wall 31 of the underground structure 3.

[0042] Specifically, step S7 includes: S71. Tie the reinforcing bars of the extension strip to the upper part of the support plate and the gap between the support structure and the outer wall of the underground structure, and the reinforcing bars are effectively connected to the reserved reinforcing bars of the support plate and the outer wall. S72. Install the side formwork of the extension strip, pour C45P8 concrete of the same grade as the support plate, and ensure that the thickness of the extension strip is consistent with that of the support plate to ensure a smooth plate surface. S73. After the extension slab is poured, it forms an integral load-bearing system with the supporting slab and the underground structure exterior wall. After curing to the design strength, the subsequent superstructure construction can be carried out.

[0043] This invention achieves efficient space utilization and safe co-construction of the foundation for historical buildings and the newly constructed building, realizing "zero-distance" co-construction. The invention integrates the foundation pit support structure of the new building, the foundation load-bearing structure of the new building, and the newly added foundation for the historical building into one unit. Under the extremely limited conditions where the edge of the basement of a new building in a historic old city is adjacent to the foundation of an immovable historical building, the support structure is set along the outline of the foundation pit. A support plate connects the top of the support structure to the load-bearing exterior wall of the historical building, and an extension strip connects to the exterior wall of the underground structure, achieving a "three-in-one" co-construction of foundation pit support, new building foundation, and historical building reinforcement. This structure minimizes disturbance to immovable cultural relics, achieving safe construction with "zero distance" or even "negative distance," effectively solving the problems of traditional solutions where the foundation pit support structure easily encroaches on the cultural relic protection area or requires sacrificing the basement area of ​​the new building.

[0044] The co-construction structure of the new foundation and the new building of the heritage building in this invention has a significant effect on the protection of heritage sites and greatly reduces construction disturbance. This invention uses SMW (three-axis mixing piles with H-beams inserted) to form a retaining structure that combines load-bearing and water-stopping functions. Construction is virtually noiseless and has minimal impact on the surrounding environment. The support plate (1800mm thick, strength grade C45P8), as the new foundation of the heritage building, directly reinforces the load-bearing exterior walls of the heritage building, effectively controlling uneven settlement. Compared with traditional solutions where temporary support structures are later demolished or abandoned, and repeated excavation vibrations pose a continuous threat to the safety of heritage sites, this invention avoids repeated disturbances and significantly improves the protection of heritage sites.

[0045] This invention integrates the structural functions of the newly added foundation and the newly constructed building in a unified structure, ensuring safety and reliability. It transforms the traditionally temporary foundation pit support structure into a permanent component. The retaining piles, H-shaped steel reinforcement, capping beams (700×1200mm, C30 concrete), steel supports (φ609mm steel pipes), and underground structure (base slab C45P8, exterior walls C40, roof slab C35) together form a stable load-bearing system. The support plate is rigidly connected to the exterior walls of the underground structure via extended strips. Backfill soil is compacted in layers between the support structure and the exterior walls. The overall structure exhibits clear stress distribution and a well-defined force transmission path, resulting in high safety and reliability.

[0046] This invention optimizes the construction process for the co-construction of foundations and new buildings in historical buildings, significantly shortening the construction period. Traditional new construction requires the construction of temporary support structures before the main structure, a complex and time-consuming process. This invention organically connects the construction of support structures, the pouring of support slabs, and the pouring of underground structures. Once completed, the support structure can be directly integrated into the permanent structure without dismantling. The optimized construction process reduces temporary engineering steps, effectively shortening the overall construction period.

[0047] The co-construction structure for new foundations and new buildings in this invention saves engineering materials and costs, resulting in significant economic benefits. Traditional support structures, as temporary works, need to be dismantled or abandoned later, leading to material waste. This invention uses the support structure as a permanent structure, avoiding the dismantling and abandonment of temporary structures; the H-beams in the SMW method piles meet permanent load-bearing requirements and can also be recycled, with costs significantly lower than traditional solutions such as diaphragm walls. Overall, it saves a large amount of engineering materials and construction costs, resulting in significant economic benefits.

[0048] The co-construction structure for the new foundation and new building of historical buildings in this invention effectively controls the deformation of the foundation pit and the historical building. Through the coordinated work of the support structure, steel bracing, and underground structure, as well as refined construction control of layered excavation and backfilling, this invention can effectively control the horizontal and vertical displacement of the foundation pit and the surface settlement of the surrounding historical buildings. The entire construction process can be managed through information-based monitoring of settlement and tilt, ensuring the safety of the historical building during construction.

[0049] The co-construction structure of the new foundation for historical buildings and the new building in this invention avoids the waste of materials and disposal of temporary support structures, and conforms to the concepts of green construction and sustainable development. The "three-in-one" permanent structural design concept, which integrates foundation pit support, new building foundation load-bearing, and cultural relic protection functions, is technologically advanced and provides a reliable technical reference and engineering model for new construction projects in similar historical urban areas adjacent to cultural relics.

[0050] The co-construction structure of the new foundation for cultural relics and the new building is particularly suitable for complex engineering conditions in historical old city areas where new buildings are located next to the foundations of immovable cultural relics and ancient buildings. It has important application value for construction projects with limited space and high protection requirements, such as urban core areas and historical districts.

[0051] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A structure for the joint construction of a new foundation for a historical building and a newly constructed building, characterized in that, include: The support structure includes multiple retaining piles and a capping beam. The multiple retaining piles are arranged along the outline of the foundation pit of the new building, and the capping beam is connected to the upper end of the multiple retaining piles. A support plate is connected to the top of the support structure and the load-bearing exterior wall of the cultural relic building adjacent to the new building; The underground structure is cast inside the support structure. The support plate is connected to the outer wall of the underground structure through an extension strip. Backfill soil is filled between the support structure and the outer wall.

2. The co-construction structure of the new foundation and the new building of the cultural relic building according to claim 1, characterized in that, The retaining piles are triaxial mixing piles, and steel ribs are inserted inside the triaxial mixing piles.

3. The co-construction structure of the new foundation and the new building of the cultural relic building according to claim 2, characterized in that, The steel frame is an H-beam.

4. The co-construction structure of the new foundation and the new building of the cultural relic building according to claim 1, characterized in that, The capping beam is a concrete capping beam.

5. The co-construction structure of the new foundation and the new building of the cultural relic building according to claim 1, characterized in that, The inner side of the crown beam is provided with steel support.

6. A construction method for a structure where a new foundation for a historical building and a newly constructed building are jointly constructed, as described in any one of claims 1 to 5, characterized in that, Includes the following steps: Multiple retaining piles are driven along the outline of the foundation pit of the new building; A support slab is poured between the top of the multiple retaining piles and the load-bearing exterior wall of the adjacent historical building of the new building; A cap beam is poured on top of the multiple retaining piles to form a support structure; A steel support is provided on the inner side of the cap beam; Excavate the earthwork inside the support structure and pour the underground structure of the new building; Backfill soil is filled between the support structure and the lower part of the outer wall; An extension strip is cast along the surface of the support plate between the upper part of the support structure and the outer wall, so that the extension strip is connected to the outer wall of the underground structure.

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